Could the error screens which appear, e.g. when you try to join a server, fail and return to the main menu, have something helpful that the player can act on, or are the errors too wide-ranging?
There can be many causes for any type of error, although sometimes one can more likely be the actual cause than others.
My minor todo list for /server:
Logging of rcon use is pitiful, at best, and must be improved
Common error messages (G_parseSpawns, in particular) that constantly show up on the Trem forums should be improved to say things that are useful.
Add this please:
http://www.mercenariesguild.net/patches/?do=details&task_id=100